Repo cleanup

[rly]

• Fix typos
• Update copyright
• Remove unnecessary exceptions to flake8
• Move some exceptions to flake8 to preferred place in setup.cfg

[codecov]

Codecov Report

Merging #138 into dev will decrease coverage by <.01%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##              dev     #138      +/-   ##
==========================================
- Coverage   69.06%   69.05%   -0.01%     
==========================================
  Files          24       24              
  Lines        4968     4967       -1     
  Branches     1137     1137              
==========================================
- Hits         3431     3430       -1     
  Misses       1170     1170              
  Partials      367      367

Impacted Files	Coverage Δ
src/hdmf/__init__.py	50% <ø> (ø)	⬆️
src/hdmf/backends/hdf5/__init__.py	100% <ø> (ø)	⬆️
src/hdmf/backends/__init__.py	100% <ø> (ø)	⬆️
src/hdmf/spec/__init__.py	100% <ø> (ø)	⬆️
src/hdmf/build/builders.py	84.69% <ø> (ø)	⬆️
src/hdmf/build/__init__.py	100% <ø> (ø)	⬆️
src/hdmf/monitor.py	0% <0%> (ø)	⬆️
src/hdmf/validate/validator.py	63.06% <100%> (ø)	⬆️
src/hdmf/validate/__init__.py	100% <100%> (ø)	⬆️
src/hdmf/backends/hdf5/h5tools.py	63.6% <100%> (ø)	⬆️
... and 2 more

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